Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction

Jin, Lei; Jang, Hohyoun; Yoo, Jiho; Ha, Jaeseong; Choi, Kunyoung; Ryu, Taewook; Lee, Sungkwun; Kim, Whangi

doi:10.3390/polym8040114

Open AccessArticle

Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction

by

Lei Jin

^†,

Hohyoun Jang

^†,

Jiho Yoo

,

Jaeseong Ha

,

Kunyoung Choi

,

Taewook Ryu

,

Sungkwun Lee

and

Whangi Kim

^*

Department of Applied Chemistry, Konkuk University, Chungju 380-701, Korea

^*

Author to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Polymers 2016, 8(4), 114; https://doi.org/10.3390/polym8040114

Submission received: 2 February 2016 / Revised: 22 March 2016 / Accepted: 24 March 2016 / Published: 29 March 2016

(This article belongs to the Special Issue Conductive Polymers 2016)

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Abstract

Spiro poly(isatin-ethersulfone) polymers were prepared from isatin and bis-2,6-dimethylphenoxyphenylsulfone by super acid catalyzed polyhydroxyalkylation reactions. We designed and synthesized bis-2,6-dimethylphenoxyphenylsulfone, which is structured at the meta position steric hindrance by two methyl groups, because this structure minimized crosslinking reaction during super acid catalyzed polymerization. In addition, sulfonic acid groups were structured in both side chains and main chains to form better polymer chain morphology and improve proton conductivity. The sulfonation reactions were performed in two steps which are: in 3-bromo-1-propanesulfonic acid potassium salt and in con. sulfuric acid. The membrane morphology was studied by tapping mode atomic force microscope (AFM). The phase difference between the hydrophobic polymer main chain and hydrophilic sulfonated units of the polymer was shown to be the reasonable result of the well phase separated structure. The correlations of proton conductivity, ion exchange capacity (IEC) and single cell performance were clearly described with the membrane morphology.

Keywords: PEM; super acid; spiro structure; dimensional stability; proton conductivity; carbon-carbon linkage

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MDPI and ACS Style

Jin, L.; Jang, H.; Yoo, J.; Ha, J.; Choi, K.; Ryu, T.; Lee, S.; Kim, W. Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers 2016, 8, 114. https://doi.org/10.3390/polym8040114

AMA Style

Jin L, Jang H, Yoo J, Ha J, Choi K, Ryu T, Lee S, Kim W. Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers. 2016; 8(4):114. https://doi.org/10.3390/polym8040114

Chicago/Turabian Style

Jin, Lei, Hohyoun Jang, Jiho Yoo, Jaeseong Ha, Kunyoung Choi, Taewook Ryu, Sungkwun Lee, and Whangi Kim. 2016. "Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction" Polymers 8, no. 4: 114. https://doi.org/10.3390/polym8040114

APA Style

Jin, L., Jang, H., Yoo, J., Ha, J., Choi, K., Ryu, T., Lee, S., & Kim, W. (2016). Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction. Polymers, 8(4), 114. https://doi.org/10.3390/polym8040114

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Studies of Grafted and Sulfonated Spiro Poly(isatin-ethersulfone) Membranes by Super Acid-Catalyzed Reaction

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